[coreboot] #160: Build system: There's no convincing CFLAGS management for util/*

[coreboot]

#160: Build system: There's no convincing CFLAGS management for util/*
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    Reporter:  oxygene   |         Owner:  oxygene          
        Type:  task      |        Status:  new              
    Priority:  major     |     Milestone:                   
   Component:  coreboot  |      Keywords:                   
Dependencies:            |   Patchstatus:  there is no patch
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 Right now, all utils build with -Iutil/kconfig. We're only lucky that
 there's no file name overlap.

This should be cleaned up.